If 20% of a number is added to another number, the second number increases by 50%. What is the ratio of the first number to the second number? MCQ with Answer and Explanation

Explanation:
Total = 3k+2k=5k. Present boys=0.9×3k=2.7k, present girls=0.85×2k=1.7k, total present=4.4k. Fraction = 4.4k/5k = 44/50 = 22/25. So answer 22/25, option D. Wait, 4.4/5 = 0.88 = 22/25. So D. I'll set options accordingly.

Explanation:
Pass at least one = 85+75-65=95%, fail both = 5%.

Explanation:
Failed in at least one = 35+30-20 = 45%. Passed in both = 55% = 550 → total = 550/0.55 = 1000.